Improvement in hoisting apparatus



UNITED STATES:

PATENT OFFICE.

T HEODORE KRAUSGH, OF NEW YORK, N. Y.

IMPROVEMENT ilN HOISTING APPARATUS.

Speciication forming part of Letters Patent No. 121,386, dated November 28, 1871 antedated November 18, 1871.

To all whom it may concern:

Be it known that I, THEonoEE KRAUscH, of the city, coimty, and State of New York, have invented a new and useful Improvement in Hoisting` Apparatus; and I do hereby declare the following to be a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawing forming part of this specification, in which drawing- Figure l represents a front view of this invention. Fig. 2 is a horizontal section of the same taken in the plane indicated by the line a' a', Fig. 1.

Similar letters indicate corresponding parts.

This invention relates particularly to an improvement in the clamp of a hoisting' apparatus, said clamp being constructed of two arms, united by a pivoted and provided with selfadjusting jaws, which are connected to said arm by screws, on which they can swivel in either direction, with elastic friction-pads interposed between the arms and their jaws in such a manner that the jaws are capable of adapting themselves to the inequalities in the surface of the article to be clamped, and that said article, while being retained in the clamp, can be swung freely in the plane of its axis or in a plane vertical to that passing through the swivel-screws of the jaws. The jaws are provided each with four arms, carryin g rollers in their ends, so that the article retained by the clamp can be revolved round its own axis. A suitable clamping-screw, pivoted to the upper end of one ofthe arms and capable of catching in a slotted bearing on the upper end of the other arm ofthe clamp, serves to press the jaws up against the article to be clamped.

In the drawing, A designates a clamp, which is composed of two curved arms, a c', united by a pivot, b. To the bottom end of each of these arms is attached a jaw, C, said jaws being connected to their arms by means of screws c, which pass loosely through the ends of the arms, so that the jaws are free to swivel on them. Between the j aws and their arms are interposed elastic pads d; and if the nuts of the screws c are screwed up lightly the friction of the pads prevents the jaws from turning round on their screws spontaneously, and at the same time, by said elastic pads, the jaws are enabled to accommodate themselves, to a certain extent, to any inequalities existing in the surface of the articles to be clamped. Each of the jaws O is constructed with two arms, e, which are mounted on the ends of a cross-head, j', and the ends of which are armed with friction-rollers g. The arms c are connected to their cross-heads in such a manner that they are free to turn thereon, and that the ends of each arm can iind their bearings against the surface of the article to be clamped; or, if desired, said arms may be made in the form of strong springs, so as to be able to accommodate themselves to any inequality existing in the surface ofthe article to be clamped.

If my clamp is applied to a cylindrical article or to a barrel or cask the friction-rollers y allow of turning said article, when suspended in the clamp, round its own axis, while the swivelscrews c allow of swinging the saine round in a vertical plane, passing through its axis 5 and for this reason my clamp is of particular advantage for the purpose of rolling` barrels or casks, but it can also be used with great convenience for holding heavy shafts or other articles in forges or in machine-shops.

The arms a c extend beyond their pivot b, and from their upper ends extend links jj', which connect with the hoisting-tackle, as shown in Fig. l. If a strain is applied to the hoistingtackle the upper ends of the arms c a are drawn together and the jaws C are pressed up against the article to be clamped.

It is desirable, however, to apply pressure to the jaws C before the article is raised from the ground. This purpose I effect by means of a screw, lc, which is connected to the upper end of the arm a, by a joint, l, and which drops in a slotted bracket or bearing, m, attached to the upper end of the arm c. If the nut on the screw k is screwed up the upper ends of the arms c a are drawn together, and the jaws C are brought to bear against the surface of the article to be clamped.

For the purpose of rolling barrels the hoistingtackle which is used in the operation may be suspended from a simple derrick, such as shown in the drawing; but my elzunp can be used with substantially as described, for the purpose speciztdvztntztge for cranes 0r other hoisting-machines fied.

of any desired construction. 2. In combination with the clamp A and swiv- What I claim as new, and desire to secure by eled jaws C, the elastic pads d, substantially as Letters Patent, sdescribed, for the purpose specified.

l. The clamp for al10isting-Inaehine, eonsist- THEODORE KRAUSCH. ing essentially of the pivoted in'nis a a', the Witnesses: swiveled jaws C carrying friction-rollers g in the W. HAUFF,

arms e, the links j j, and the clamping-screw lf, E. F. KASTENHUBER. (79) 

